Building Bricks Block Base Plates - Black 6 Pack of 5" x 10" Baseplates - Tight Fit with Major Brick Sets 6 packs 5 x 10 inch (16 X 32 studs) black baseplates ,ABS material Compatible with Major Brands and major brick sets,Not for DUPLO sized blocks Keeps your creations together ,easy to carry and tight fit.Great for group building. Recommended for age 3 and up. The plates are not affiliated with or endorsed in any way by Lego, a registered trademark of Lego Systems